// ============================================================================
//
// Copyright (C) 2006-2007 Dengues
//
// Google Group: http://groups.google.com/group/dengues
// QQ Group: 24885404
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// ============================================================================
package org.dengues.core.jdk;

import org.apache.log4j.Logger;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.ITypeHierarchy;
import org.eclipse.jdt.core.JavaModelException;

/**
 * Qiang.Zhang.Adolf@gmail.com class global comment. Detailled comment <br/>
 * 
 * $Id: Dengues.epf 1 2006-09-29 17:06:40Z qiang.zhang $
 * 
 */
public class ClassSearchEngine {

    private static Logger logger = Logger.getLogger(ClassSearchEngine.class);

    private final String className;

    private final IJavaProject javaProject;

    /**
     * Qiang.Zhang.Adolf@gmail.com ClassSearchEngine constructor comment.
     * 
     * @param className
     * @param javaProject
     */
    public ClassSearchEngine(String className, IJavaProject javaProject) {
        this.className = className;
        this.javaProject = javaProject;
    }

    /**
     * Qiang.Zhang.Adolf@gmail.com Comment method "getModelConstraintType".
     * 
     * @param javaProject
     * @return
     * @throws JavaModelException
     */
    private IType getModelConstraintType(IJavaProject javaProject) throws JavaModelException {
        return javaProject.findType(className);
    }

    /**
     * Qiang.Zhang.Adolf@gmail.com Comment method "computeSubJavaElements".
     * 
     * @return
     */
    public IType[] computeSubJavaElements() {
        try {
            IType type = getModelConstraintType(javaProject);
            if (type != null) {
                ITypeHierarchy hierarchy = type.newTypeHierarchy(null);
                return hierarchy.getSubtypes(type);
            }
        } catch (JavaModelException e) {
            logger.error("Search " + className + "'s sub Classes Error: ", e); //$NON-NLS-1$ //$NON-NLS-2$
        }
        return null;
    }

}
